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May Weather in Brussels, United States

Last updated: June 24, 2025

In Brussels, United States, the average temperature in May hovers around 11°C (53°F), with nightly lows dipping to a chilly 0°C (32°F) and daytime highs reaching a comfortable 25°C (77°F). Expect 95 mm (3.8 in) of precipitation spread over approximately 11 days, coupled with a relatively high average humidity of 77%. It's a month where layers and an umbrella will serve you well!

May Temperature in Brussels

In May in Brussels, the average temperature is 11°C (53°F). The maximum can reach 25°C (77°F) and the minimum can be as low as 0°C (32°F). Be sure to pack layers for your trip, as the weather can vary significantly from warm to chilly.

May Weather in Brussels: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Brussels, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brussels, May typically has an average temperature of 11°C (53°F), with highs reaching up to 25°C (77°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec222232405264717063513729
Data source: Temperature data for Brussels generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Brussels

In Brussels in May, the precipitation amount is 95 mm (3.8 in) spread over 11 days.

May Precipitation Trends in Brussels

The chart displays monthly precipitation patterns in Brussels, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Brussels, May typically receives around 95 mm (3.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec4250589295101909666995356
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Brussels

In Brussels in May humidity is 77%. With an average temperature of 11°C (53°F), this humidity feels like a damp chill that clings to your skin, making outdoor activities require extra layers and a quick adjustment to the cool, moist air.

May Average Humidity in Brussels

This chart illustrates the average monthly humidity levels in Brussels, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Brussels is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%87%84%77%75%75%73%78%84%89%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Brussels

In Brussels in May, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Brussels.

Maximum UV Index Levels in Brussels for May

The chart shows the monthly maximum UV Index (UVI) for Brussels in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Brussels typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997532
Data source: Brussels May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How May Weather in Brussels Compares to Other Months

Weather in Brussels varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Brussels, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Brussels, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)42 mm (1.6 inches)89%low
February Weather-5°C (22°F)50 mm (2.0 inches)90%moderate
March Weather0°C (32°F)58 mm (2.3 inches)87%moderate
April Weather5°C (41°F)92 mm (3.6 inches)84%high
May Weather11°C (53°F)95 mm (3.8 inches)77%very high
June Weather18°C (64°F)101 mm (4.0 inches)75%very high
July Weather22°C (72°F)90 mm (3.6 inches)74%very high
August Weather21°C (70°F)96 mm (3.8 inches)73%very high
September Weather17°C (63°F)66 mm (2.6 inches)78%high
October Weather11°C (51°F)99 mm (3.9 inches)84%moderate
November Weather3°C (37°F)53 mm (2.1 inches)89%moderate
December Weather-2°C (29°F)56 mm (2.2 inches)87%low

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